[PATCH] ALSA: usb-audio: Fix unsigned expression compared with zero

[kernel test robot]

Hi Zhongjun,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on tiwai-sound/for-next]
[also build test WARNING on linus/master v5.19-rc5 next-20220708]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhongjun-Tan/ALSA-usb-audio-Fix-unsigned-expression-compared-with-zero/20220706-150825
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-next
config: s390-randconfig-s031-20220710 (https://download.01.org/0day-ci/archive/20220710/202207101502.ZdivUZX6-lkp@intel.com/config)
compiler: s390-linux-gcc (GCC) 11.3.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-39-gce1a6720-dirty
        # https://github.com/intel-lab-lkp/linux/commit/10d09dc3ad3a9b823d9097a68058698be90c7a74
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zhongjun-Tan/ALSA-usb-audio-Fix-unsigned-expression-compared-with-zero/20220706-150825
        git checkout 10d09dc3ad3a9b823d9097a68058698be90c7a74
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=s390 SHELL=/bin/bash sound/usb/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>


sparse warnings: (new ones prefixed by >>)
>> sound/usb/pcm.c:782:32: sparse: sparse: incompatible types in comparison expression (different signedness):
>> sound/usb/pcm.c:782:32: sparse:    unsigned int *
>> sound/usb/pcm.c:782:32: sparse:    int *
   sound/usb/pcm.c:783:32: sparse: sparse: incompatible types in comparison expression (different signedness):
   sound/usb/pcm.c:783:32: sparse:    unsigned int *
   sound/usb/pcm.c:783:32: sparse:    int *
   sound/usb/pcm.c:791:40: sparse: sparse: incompatible types in comparison expression (different signedness):
   sound/usb/pcm.c:791:40: sparse:    unsigned int *
   sound/usb/pcm.c:791:40: sparse:    int *
   sound/usb/pcm.c:792:40: sparse: sparse: incompatible types in comparison expression (different signedness):
   sound/usb/pcm.c:792:40: sparse:    unsigned int *
   sound/usb/pcm.c:792:40: sparse:    int *

vim +782 sound/usb/pcm.c

7726dce14c5e7e Takashi Iwai 2020-11-23  761  
e5779998bf8b70 Daniel Mack  2010-03-04  762  static int hw_rule_rate(struct snd_pcm_hw_params *params,
e5779998bf8b70 Daniel Mack  2010-03-04  763  			struct snd_pcm_hw_rule *rule)
e5779998bf8b70 Daniel Mack  2010-03-04  764  {
e5779998bf8b70 Daniel Mack  2010-03-04  765  	struct snd_usb_substream *subs = rule->private;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  766  	struct snd_usb_audio *chip = subs->stream->chip;
cab941b7e5cf05 Takashi Iwai 2020-11-23  767  	const struct audioformat *fp;
e5779998bf8b70 Daniel Mack  2010-03-04  768  	struct snd_interval *it = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
10d09dc3ad3a9b Zhongjun Tan 2022-07-06  769  	unsigned int rmin, rmax;
10d09dc3ad3a9b Zhongjun Tan 2022-07-06  770  	int i, r;
e5779998bf8b70 Daniel Mack  2010-03-04  771  
e5779998bf8b70 Daniel Mack  2010-03-04  772  	hwc_debug("hw_rule_rate: (%d,%d)\n", it->min, it->max);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  773  	rmin = UINT_MAX;
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  774  	rmax = 0;
88766f04c4142c Eldad Zack   2013-04-03  775  	list_for_each_entry(fp, &subs->fmt_list, list) {
e5779998bf8b70 Daniel Mack  2010-03-04  776  		if (!hw_check_valid_format(subs, params, fp))
e5779998bf8b70 Daniel Mack  2010-03-04  777  			continue;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  778  		r = snd_usb_endpoint_get_clock_rate(chip, fp->clock);
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  779  		if (r > 0) {
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  780  			if (!snd_interval_test(it, r))
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  781  				continue;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29 @782  			rmin = min(rmin, r);
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  783  			rmax = max(rmax, r);
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  784  			continue;
4e7cf1fbb34ecb Takashi Iwai 2021-09-29  785  		}
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  786  		if (fp->rate_table && fp->nr_rates) {
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  787  			for (i = 0; i < fp->nr_rates; i++) {
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  788  				r = fp->rate_table[i];
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  789  				if (!snd_interval_test(it, r))
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  790  					continue;
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  791  				rmin = min(rmin, r);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  792  				rmax = max(rmax, r);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  793  			}
e5779998bf8b70 Daniel Mack  2010-03-04  794  		} else {
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  795  			rmin = min(rmin, fp->rate_min);
bc4e94aa8e72e7 Takashi Iwai 2020-11-23  796  			rmax = max(rmax, fp->rate_max);
e5779998bf8b70 Daniel Mack  2010-03-04  797  		}
e5779998bf8b70 Daniel Mack  2010-03-04  798  	}
e5779998bf8b70 Daniel Mack  2010-03-04  799  
7726dce14c5e7e Takashi Iwai 2020-11-23  800  	return apply_hw_params_minmax(it, rmin, rmax);
e5779998bf8b70 Daniel Mack  2010-03-04  801  }
e5779998bf8b70 Daniel Mack  2010-03-04  802  

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